Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Description Of Business [Abstract]

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Cumulative amount of stock repurchased under the repurchase plan.

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General, Description of Business, and Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Sep. 03, 2021
General and Description Of Business [Abstract]
Stock Repurchase Program, Authorized Amount				$ 1,500
Stock Repurchase Program Cumulative Amount Purchased	$ 139
Purchases of treasury stock	$ 0	$ 0
Williams Companies Inc [Member] \| Gulfstar One [Member] \| Variable Interest Entity, Primary Beneficiary [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage	51.00%
Williams Companies Inc [Member] \| Northeast JV [Member] \| Variable Interest Entity, Primary Beneficiary [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage	65.00%
Williams Companies Inc [Member] \| Cardinal Gas Services LLC [Member] \| Variable Interest Entity, Primary Beneficiary [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage	66.00%
Transmission And Gulf Of America [Member] \| Gulfstream Natural Gas System, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage	50.00%
Transmission And Gulf Of America [Member] \| Discovery Producer Services LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage			60.00%
Northeast G And P [Member] \| Blue Racer Midstream LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage	50.00%
West [Member] \| Overland Pass Pipeline Company LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage	50.00%
West [Member] \| Williams Companies Inc [Member] \| Conway Fractionator [Member]
General and Description Of Business [Abstract]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	50.00%